The White House is not finding funny reports of preparations for another chemical weapons attack by Syria.

So it has issued a stern warning to President Bashar Assad. 

In an ominous statement issued late Monday with no supporting evidence or further explanation, Press Secretary Sean Spicer said the U.S. had "identified potential preparations for another chemical weapons attack by the Assad regime that would likely result in the mass murder of civilians, including innocent children."

He said the activities were similar to preparations taken before an April 2017 attack that killed dozens of men, women and children, and warned that if "Mr. Assad conducts another mass murder attack using chemical weapons, he and his military will pay a heavy price."

The White House offered no details on what prompted the warning.